我不会使用正则表达式：它很难做到正确，并处理适当月份的天数。

相反，看看使用DateTime.TryParseExact：

 DateTime dt; 
 if （DateTime.TryParseExact（  12 -Oct-2011 22:34，  dd-MMM-yyyy HH：mm，CultureInfo.InvariantCulture，DateTimeStyles.None， out  dt））
 {
 Console.WriteLine（dt）; 
} 

试试这个\d {2} / \d {2} / \d {4}转到正则表达式在这里写一个表达式：validate expression \d {2} / \d {2} / \d {4}



这将验证它为dd / mm / yyyy

为我的解决方案我做了这个正则表达式以验证此格式中的日期时间

 dd-MMM-yyyy HH：mm 

这是正则表达式使用

   ^（0？[1-9 ] | [12] [0-9] | 3 [01]） - （月|月| JAN | 2月| 2月| 2月| 3月| 3月| MAR |四月|四月|四月|可能会|五月|五月|六月|君| JUN |七月|七月| JUL |八月|八月| AUG |九月|九月| SEP |十月|十月|华侨城| 11月| 11月| 11月| 12月| 12月| DEC） - （19 | 20）\d\\ \\d\s（[0-1] [0-9] | [2] [0-3]）：（[0-5] [0-9]）

I have one textbox and also one MaskedEditExtender to attache with that text box for entering value in this formate like dd-MMM-yyyy HH:mm....
now i want to put one RegularExpressionValidator to validate that text box.....


i have put it like this...

<asp:TextBox ID="TextBox9" runat="server" Text='<%# Bind("ABOVEROTARYTABLE", "{0:d-MMM-yyyy HH:mm}") %>'>
<cc1:MaskedEditExtender ID="MaskedEditExtender4"  runat="server" ClearMaskOnLostFocus="False"

    CultureName="en-GB" Mask="99-LLL-9999 99:99" TargetControlID="TextBox9" UserDateFormat="DayMonthYear">

<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="TextBox9"

ErrorMessage="Invalid DateTime" 

 ValidationGroup="GridViewBHAHistory"

ValidationExpression=""

now i want regular expression to validate my input.....

Valid like

12-Oct-2011 22:34
23-dec-1988 02:09

or not valid like

43-TTT-8888 88:98
12-oct-2011 25:39

help me....

I wouldn't use a Regex for this: it is too difficult to get it right, and handle the number of days in the appropriate month.
Instead, look at using DateTime.TryParseExact:

DateTime dt;
if (DateTime.TryParseExact("12-Oct-2011 22:34", "dd-MMM-yyyy HH:mm", CultureInfo.InvariantCulture, DateTimeStyles.None, out dt))
    {
    Console.WriteLine(dt);
    }

try this \d{2}/\d{2}/\d{4} go to the regular expression properties and in that write a expression in:validate expression \d{2}/\d{2}/\d{4}

this will validate it to dd/mm/yyyy

for my solution i made this regular expression to validate datetime in this formate

dd-MMM-yyyy HH:mm

this is the regular expression use

"^(0?[1-9]|[12][0-9]|3[01])-(jan|Jan|JAN|feb|Feb|FEB|mar|Mar|MAR|apr|Apr|APR|may|May|MAY|jun|Jun|JUN|jul|Jul|JUL|aug|Aug|AUG|sep|Sep|SEP|oct|Oct|OCT|nov|Nov|NOV|dec|Dec|DEC)-(19|20)\d\d\s([0-1][0-9]|[2][0-3]):([0-5][0-9])